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SubjectRe: gcc 4.5.1 / as miscompiling drivers/char/i8k.c ?
On Mon, Nov 15, 2010 at 7:45 PM, Jeff Law <> wrote:
> On 11/08/10 03:49, Richard Guenther wrote:
>> On Mon, Nov 8, 2010 at 12:03 AM, Andi Kleen<>  wrote:
>>> Andreas Schwab<>  writes:
>>>> The asm fails to mention that it modifies *regs.
>>> It has a memory clobber, that should be enough, no?
>> No.  A memory clobber does not cover automatic storage.
> A memory clobber should clobber anything in memory, including autos in
> memory; if it doesn't, then that seems like a major problem.  I'd like to
> see the rationale behind not clobbering autos in memory.

Non-address taken automatic storage. (note that we don't excercise this
in optimization yet)

It's difficult to model thins kind of non-aliased memory with this kind
of aliasing mechanism (apart from taking all asms as clobbering
everything as we currently do).


> Jeff
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